# LittlevGL - Free Open-source Embedded GUI Library
**LittlevGL provides everything you need to create a Graphical User Interface (GUI) on embedded systems with easy-to-use graphical elements, beautiful visual effects and low memory footprint.**
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### [Website](https://littlevgl.com) · [Live demo](https://littlevgl.com/live-demo) · [Simulator](https://docs.littlevgl.com/#PC-simulator) · [Docs](https://docs.littlevgl.com/) · [Blog](https://blog.littlevgl.com/)
### Features
* **Powerful building blocks** buttons, charts, lists, sliders, images, etc.
* **Advanced graphics** with animations, anti-aliasing, opacity, smooth scrolling
* **Various input devices** touch pad, mouse, keyboard, encoder, buttons, etc.
* **Multi-language support** with UTF-8 encoding
* **Fully customizable** graphical elements
* **Hardware independent** to use with any microcontroller or display
* **Scalable** to operate with little memory (50 kB Flash, 10 kB RAM)
* **OS, External memory and GPU** supported but not required
* **Single frame buffer** operation even with advances graphical effects
* **Written in C** for maximal compatibility
* **Simulator** to develop on PC without embedded hardware
* **Tutorials, examples, themes** for rapid development
* **Documentation** and API references online
### Supported devices
Basically, every modern controller - which is able to drive a display - is suitable to run LittlevGL. The minimal requirements:
- **16, 32 or 64-bit** microcontroller or processor
- **> 16 MHz** clock speed
- **> 8 kB RAM for static data** and **> 2 KB RAM for dynamic data** (graphical objects)
- **> 64 kB flash** program memory
- **Optionally ~1/10 screen sized memory** for buffered drawing (on 240 × 320, 16-bit colors it's 15 kB)
Just to mention some **platforms**:
- STM32F1, STM32F3, [STM32F4](https://blog.littlevgl.com/2017-07-15/stm32f429_disco_port), [STM32F7](https://github.com/littlevgl/stm32f746_disco_no_os_sw4stm32)
- Microchip dsPIC33, PIC24, PIC32MX, PIC32MZ
- NXP Kinetis, LPC, iMX
- [Linux frame buffer](https://blog.littlevgl.com/2018-01-03/linux_fb) (/dev/fb)
- [Raspberry PI](http://www.vk3erw.com/index.php/16-software/63-raspberry-pi-official-7-touchscreen-and-littlevgl)
- [Espressif ESP32](https://github.com/littlevgl/esp32_ili9431)
- Nordic nrf52
- Quectell M66
### Quick start in a simulator
Try LittlevGL in a simulator on you PC without any embedded hardware. Choose a project with your favourite IDE:
| Eclipse | CodeBlock | Visual Studio | PlatfomIO | Qt Creator |
|-------------|----------- |---------------|-----------|------------|
| [](https://github.com/littlevgl/pc_simulator_sdl_eclipse) | [](https://github.com/littlevgl/pc_simulator_win_codeblocks) | [](https://github.com/littlevgl/visual_studio_2017_sdl_x64) | [](https://github.com/littlevgl/pc_simulator_sdl_platformio) | [](https://blog.littlevgl.com/2019-01-03/qt-creator) |
| Cross-platform
with SDL | Native Windows | Cross-platform
with SDL | Cross-platform
with SDL | Cross-platform
with SDL |
### Porting to an embedded hardware
In the most simple case you need to do 5 things:
1. Call `lv_tick_inc(x)` every `x` milliseconds in a Timer or Task (`x` should be between 1 and 10)
2. Register a function which can **copy a pixel array** to an area of the screen.
3. Register a function which can **read an input device**. (E.g. touch pad)
4. Copy `lv_conf_templ.h` as `lv_conf.h` next to `lvgl` and set at least `LV_HOR_RES`, `LV_VER_RES` and `LV_COLOR_DEPTH`.
5. Call `lv_task_handler()` periodically every few milliseconds.
For a detailed description check the [Online documatation](https://docs.littlevgl.com/#Porting) or the [Porting tutorial](https://github.com/littlevgl/lv_examples/blob/master/lv_tutorial/0_porting/lv_tutorial_porting.c)
### Contributing
To ask questions and discuss topics we use [GitHub's Issue tracker](https://github.com/littlevgl/lvgl/issues).
You contribute in several ways:
- **Answer other's question** click the Watch button on the top to get notified about the issues
- **Report and/or fix bugs** using the issue tracker and in Pull-request
- **Suggest and/or implement new features** using the issue tracker and in Pull-request
- **Improve and/or translate the documentation** learn more [here](https://github.com/littlevgl/docs)
- **Write a blog post about your experiences** learn more [here](https://github.com/littlevgl/blog)
- **Upload your project or product as a reference** to [this site](https://blog.littlevgl.com/2018-12-26/references)
Before contributing, please read [CONTRIBUTING.md](https://github.com/littlevgl/lvgl/blob/master/docs/CONTRIBUTING.md).
For more info read this [blog post](https://blog.littlevgl.com/2018-12-06/contributing).
### Donate
If you are pleased with the library, found it useful, or you are happy with the support you got, please help its further development:
[](https://littlevgl.com/donate)